Forensic evidence record · ev-ca3610014-f-colton-pfoa
Perfluorooctanoic acid (PFOA)
A single published measurement record with its qualifier, sampling context, source identifier, method note, and stated limitations kept together.
Published evidence record
5.9 ng/LReported measurementSource observations (15)
- PFOA — Sample date: 2023-09-13
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3I1597-01 · Method EPA 533
- PFOA — Sample date: 2024-01-23
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A3077-01 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-03 · Method EPA 533
- PFOA — Sample date: 2025-01-28
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C5A3121-01RE1 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-05 · Method EPA 533
- PFOA — Sample date: 2024-01-23
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A3077-03 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-07 · Method EPA 533
- PFOA — Sample date: 2024-01-23
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A3077-05 · Method EPA 533
- PFOA — Sample date: 2023-08-30
Detected above reporting limit. = 0.0059 µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3H4082-01 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Detected above reporting limit. = 0.0045 µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-09 · Method EPA 533
- PFOA — Sample date: 2024-01-29
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A3829-01 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-11 · Method EPA 533
- PFOA — Sample date: 2025-02-27
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C5B3449-01 · Method EPA 533
- PFOA — Sample date: 2023-07-25
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C3G3217-13 · Method EPA 533
- PFOA — Sample date: 2024-01-23
Below reporting limit. < Result value not available µg/L
Reporting limit: 0.004 µg/L. Detection limit: Not available. Benchmark unavailable
Source: src-ucmr5-2024 · UCMR5_All.txt · Sample C4A3077-09 · Method EPA 533
Measurement evidence
- Analyte
- Perfluorooctanoic acid (PFOA)
- Result qualifier
- =
- Reference basis
- 4.0 ng/L federal MCL (2024)
- Sampling location
- Entry Point to Distribution
- Water system ID
- CA3610014
- Source ID
- src-ucmr5-2024
Laboratory context
No laboratory method note was published with this record.
Sampling context
This result represents a entry point to distribution sample. It does not establish the condition at every distribution point or household tap.
Record limitation
System-level entry-point monitoring; not a measurement of the water at an individual household tap.
Source provenance
UCMR5 Analytical Results
Fifth Unregulated Contaminant Monitoring Rule (UCMR5) — PFAS occurrence data
U.S. Environmental Protection Agency · Published 2024
Nationwide entry-point monitoring for 29 PFAS and lithium under the fifth UCMR cycle. Results are entry-point-to-distribution samples, not household-tap measurements.
How to interpret this record
This page preserves one measurement. Interpretation requires its qualifier, reporting limit, reference basis, date, sampling location, and limitations; the number alone is not a safety verdict.
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